Correct cross-references:

ng_bpf.8    --> ng_bpf.4
  ng_ether.8  --> ng_ether.4
  ng_iface.8  --> ng_iface.4
  ng_pppoe.8  --> ng_pppoe.4
  ng_socket.8 --> ng_socket.4
  ng_tty.8    --> ng_tty.4
  ng_{type}.4 --> /dev/null

MFC after:	1 week

lib/libnetgraph/netgraph.3

@@ -80,7 +80,7 @@ These functions facilitate user-mode program participation in the kernel
 graph-based networking system, by utilizing the netgraph
 .Em socket
 node type (see
-.Xr ng_socket 8 ) .
+.Xr ng_socket 4 ) .
 .Pp
 .Fn NgMkSockNode
 should be called first, to create a new
@@ -246,7 +246,7 @@ in the kernel configuration
 file, or else the
 .Xr netgraph 4
 and
-.Xr ng_socket 8
+.Xr ng_socket 4
 KLD modules must have been loaded via
 .Xr kldload 8 .
 .Sh DIAGNOSTICS

libexec/pppoed/pppoed.8

@@ -51,7 +51,7 @@ by negotiating a session then envoking a
 program.  The negotiation is implemented by the
 .Dq pppoe
 netgraph node.  See
-.Xr ng_pppoe 8
+.Xr ng_pppoe 4
 for details.
 .Pp
 .Nm
@@ -91,7 +91,7 @@ is not given.  The child process will have standard input and standard output
 attached to the same
 .Xr netgraph 4
 data socket
-.Pq see Xr ng_socket 8
+.Pq see Xr ng_socket 4
 when started.
 .Pp
 Upon invocation,
@@ -169,9 +169,9 @@ and the following to
 .Xr NgSetDebug 3 ,
 .Xr netgraph 4 ,
 .Xr syslog.conf 5 ,
-.Xr ng_ether 8 ,
+.Xr ng_ether 4 ,
-.Xr ng_pppoe 8 ,
+.Xr ng_pppoe 4 ,
-.Xr ng_socket 8 ,
+.Xr ng_socket 4 ,
 .Xr ppp 8 ,
 .Xr syslogd 8
 .Sh BUGS

share/man/man4/bpf.4

@@ -702,7 +702,7 @@ struct bpf_insn insns[] = {
 .Xr tcpdump 1 ,
 .Xr ioctl 2 ,
 .Xr byteorder 3 ,
-.Xr ng_bpf 8
+.Xr ng_bpf 4
 .Rs
 .%A McCanne, S.
 .%A Jacobson V.

share/man/man4/netgraph.4

@@ -1354,7 +1354,6 @@ common networking problems, solved using
 .Xr ng_tty 4 ,
 .Xr ng_UI 4 ,
 .Xr ng_vjc 4 ,
-.Xr ng_{type} 4 ,
 .Xr ngctl 8 ,
 .Xr nghook 8
 .Sh HISTORY

share/man/man4/tty.4

@@ -176,7 +176,7 @@ Serial IP line discipline.
 PPP line discipline.
 .It NETGRAPHDISC
 Netgraph
-.Xr ng_tty 8
+.Xr ng_tty 4
 line discipline.
 .El
 .Pp
@@ -398,5 +398,5 @@ is cleared in the terminal.
 .Xr ioctl 2 ,
 .Xr pty 4 ,
 .Xr termios 4 ,
-.Xr ng_tty 8 ,
+.Xr ng_tty 4 ,
 .Xr getty 8

share/man/man4/udbp.4

@@ -98,7 +98,7 @@ IP addresses should of course be reversed.
 .Xr ohci 4 ,
 .Xr uhci 4 ,
 .Xr usb 4 ,
-.Xr ng_iface 8 ,
+.Xr ng_iface 4 ,
 .Xr ngctl 8
 .Sh HISTORY
 The

usr.sbin/nghook/nghook.8

@@ -52,7 +52,7 @@ node
 .Sh DESCRIPTION
 .Nm
 creates a
-.Xr ng_socket 8
+.Xr ng_socket 4
 socket type node and connects it to hook
 .Ar hookname
 of the node found at

usr.sbin/ppp/ppp.8

@@ -4389,7 +4389,7 @@ If no provider is given, an empty value will be used.
 Refer to
 .Xr netgraph 4
 and
-.Xr ng_pppoe 8
+.Xr ng_pppoe 4
 for further details.
 .Pp
 If a
@@ -5587,7 +5587,7 @@ This socket is used to pass links between different instances of
 .Xr init 8 ,
 .Xr isdn 8 ,
 .Xr named 8 ,
-.Xr ng_pppoe 8 ,
+.Xr ng_pppoe 4 ,
 .Xr ping 8 ,
 .Xr pppctl 8 ,
 .Xr pppd 8 ,

usr.sbin/ppp/ppp.8.m4

@@ -4389,7 +4389,7 @@ If no provider is given, an empty value will be used.
 Refer to
 .Xr netgraph 4
 and
-.Xr ng_pppoe 8
+.Xr ng_pppoe 4
 for further details.
 .Pp
 If a
@@ -5587,7 +5587,7 @@ This socket is used to pass links between different instances of
 .Xr init 8 ,
 .Xr isdn 8 ,
 .Xr named 8 ,
-.Xr ng_pppoe 8 ,
+.Xr ng_pppoe 4 ,
 .Xr ping 8 ,
 .Xr pppctl 8 ,
 .Xr pppd 8 ,